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Title page for ETD etd-11252014-112327


Type of Document Dissertation
Author Gu, Chang
Author's Email Address chang.gu@vanderbilt.edu
URN etd-11252014-112327
Title Auditory cortical narrowing to native speech: changes across development and implications for reading difficulty
Degree PhD
Department Psychology
Advisory Committee
Advisor Name Title
Bruce McCandliss Committee Chair
Geoffrey Woodman Committee Member
Megan Salyor Committee Member
Paul Yoder Committee Member
Keywords
  • reading difficulty
  • brain-behavior correlation
  • auditory cortical narrowing
  • Mismatch Negativity
Date of Defense 2014-11-10
Availability unrestricted
Abstract
An individual’s auditory cortical processing of speech sounds is substantially influenced by one’s native language experiences. Over the course of development, the brain becomes specialized to process speech sounds that are used in ambient native language environment, a phenomenon described as ‘auditory cortical narrowing to native speech’. In the current thesis, we studied the developmental changes of auditory cortical narrowing by examining the ERP response strength of mismatch negativity (MMN) to native and to non-native speech contrasts in school-age individuals from age 6 to age 17. We found that the auditory cortical narrowing continues through late childhood and adolescent, and the degree of narrowing at brain level is correlated with behavioral-level reading fluency. Also, a lack of MMN native language effect which indicates deficient auditory cortical narrowing to native speech was found in individuals with reading difficulty. These findings in the current thesis advanced our understanding of auditory cortical narrowing to native speech over development and its relationship with reading difficulty.
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